人工裂缝与天然裂缝耦合关系及其开发意义  

COUPLED RELATIONSHIP BETWEEN CREATED AND NATURAL FRACTURES AND ITS IMPLICATION TO DEVELOPMENT

作　　者：万晓龙[1] 高春宁[2] 王永康[1] 张振红[2] 闫海龙[1] 安明胜[1] 

机构地区：[1]长庆油田公司超低渗透油藏开发部,西安710021 [2]长庆油田公司勘探开发研究院,西安710021

出　　处：《地质力学学报》2009年第3期245-252,共8页Journal of Geomechanics

摘　　要：通过野外露头、成像测井、古地磁定向岩心以及岩石差应变测试等资料,对鄂尔多斯盆地延长组超低渗储集层天然裂缝的发育特征进行了系统研究,并结合微地震监测资料,对压裂缝展布规律及其与现今地应力和天然裂缝的关系进行了分析。人工压裂缝与天然裂缝具有较好的耦合作用,在陕北地区,由于天然裂缝发育,岩石的不均一性使得人工压裂缝主要沿着天然缝扩展;而在陇东地区,天然裂缝的发育程度相对较差,压裂缝的延伸方向及其形态主要受现今地应力的控制。因此,超低渗油田的开发井网部署时,既要考虑天然裂缝的发育程度,还应该考虑天然裂缝方位与地应力的匹配关系。According to outcrops, formation microscanner logging （FMI）, paleomagnetism oriented cores and stress variation difference experiment, a close study has been made on the natural fractures of super-lower permeability reservoirs in the Yanchang Formation of the Ordos basin, and in combination with microseismic monitoring technique, an analysis carried out on the relationships between created fractures and earth stress and natural fractures. The results show a good coupling between created fractures and natural fractures. In nor＇them Shaanxi, the well-developed natural fractures and heterogeneity of rocks lead the created fractures to stretch mainly along the natural fractures. In eastern Gansu, however, the natural fractures are poorly developed and the crushed fractures are controlled by present stress field. Therefore, in well pattern arrangement of super-low permeability reservoirs, our attention should be paid not only to the growth degree of the natural fractures but also to the orientation of natural fractures and their relation with the present stress field.

关 键 词：天然裂缝 人工裂缝 地应力 耦合作用 开发意义 

分 类 号：TU459.4[建筑科学—岩土工程]